We report on a passive cavity-enhanced Yb-fiber laser frequency comb generating of peak power ( of average power) at a pulse repetition rate. The intracativy peak intensity of for the pulse is sufficient to ionize noble gases, such as Xe, Kr, or Ar. The laser system is based on a mode-locked Yb-fiber similariton oscillator in conjunction with a cladding-pumped chirped-pulse fiber amplifier. After recompression, duration pulses at a average power are obtained. These pulses are then coherently added inside a passive ring cavity by controlling the fiber oscillator’s pulse repetition rate and carrier-envelope offset frequency. This system is well suited for studying high-field phenomena at very high pulse repetition rates.
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